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Simplifying 6(7r + -7) = 252 Reorder the terms: 6(-7 + 7r) = 252 (-7 * 6 + 7r * 6) = 252 (-42 + 42r) = 252 Solving -42 + 42r = 252 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 42r = 252 + 42 Combine like terms: -42 + 42 = 0 0 + 42r = 252 + 42 42r = 252 + 42 Combine like terms: 252 + 42 = 294 42r = 294 Divide each side by '42'. r = 7 Simplifying r = 7
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